﻿// Copyright 2011 Baptiste Lepilleur and The JsonCpp Authors
// Distributed under MIT license, or public domain if desired and
// recognized in your jurisdiction.
// See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE

#if !defined(JSON_IS_AMALGAMATION)
#include "assertions.h"
#include "value.h"
#include "writer.h"
#endif // if !defined(JSON_IS_AMALGAMATION)
#include <cassert>
#include <cmath>
#include <cstring>
#include <sstream>
#include <utility>
#ifdef JSON_USE_CPPTL
#include <cpptl/conststring.h>
#endif
#include <algorithm> // min()
#include <cstddef>   // size_t

// Provide implementation equivalent of std::snprintf for older _MSC compilers
#if defined(_MSC_VER) && _MSC_VER < 1900
#include <stdarg.h>
static int msvc_pre1900_c99_vsnprintf(char* outBuf,
    size_t size,
    const char* format,
    va_list ap) {
    int count = -1;
    if (size != 0)
        count = _vsnprintf_s(outBuf, size, _TRUNCATE, format, ap);
    if (count == -1)
        count = _vscprintf(format, ap);
    return count;
}

int JSON_API msvc_pre1900_c99_snprintf(char* outBuf,
    size_t size,
    const char* format,
    ...) {
    va_list ap;
    va_start(ap, format);
    const int count = msvc_pre1900_c99_vsnprintf(outBuf, size, format, ap);
    va_end(ap);
    return count;
}
#endif

// Disable warning C4702 : unreachable code
#if defined(_MSC_VER)
#pragma warning(disable : 4702)
#endif

#define JSON_ASSERT_UNREACHABLE assert(false)

namespace Json {

    template <typename T>
    static std::unique_ptr<T> cloneUnique(const std::unique_ptr<T>& p) {
        std::unique_ptr<T> r;
        if (p) {
            r = std::unique_ptr<T>(new T(*p));
        }
        return r;
    }

    // This is a walkaround to avoid the static initialization of Value::null.
    // kNull must be word-aligned to avoid crashing on ARM.  We use an alignment of
    // 8 (instead of 4) as a bit of future-proofing.
#if defined(__ARMEL__)
#define ALIGNAS(byte_alignment) __attribute__((aligned(byte_alignment)))
#else
#define ALIGNAS(byte_alignment)
#endif
// static const unsigned char ALIGNAS(8) kNull[sizeof(Value)] = { 0 };
// const unsigned char& kNullRef = kNull[0];
// const Value& Value::null = reinterpret_cast<const Value&>(kNullRef);
// const Value& Value::nullRef = null;

// static
    Value const& Value::nullSingleton() {
        static Value const nullStatic;
        return nullStatic;
    }

    // for backwards compatibility, we'll leave these global references around, but
    // DO NOT use them in JSONCPP library code any more!
    Value const& Value::null = Value::nullSingleton();
    Value const& Value::nullRef = Value::nullSingleton();

    const Int Value::minInt = Int(~(UInt(-1) / 2));
    const Int Value::maxInt = Int(UInt(-1) / 2);
    const UInt Value::maxUInt = UInt(-1);
#if defined(JSON_HAS_INT64)
    const Int64 Value::minInt64 = Int64(~(UInt64(-1) / 2));
    const Int64 Value::maxInt64 = Int64(UInt64(-1) / 2);
    const UInt64 Value::maxUInt64 = UInt64(-1);
    // The constant is hard-coded because some compiler have trouble
    // converting Value::maxUInt64 to a double correctly (AIX/xlC).
    // Assumes that UInt64 is a 64 bits integer.
    static const double maxUInt64AsDouble = 18446744073709551615.0;
#endif // defined(JSON_HAS_INT64)
    const LargestInt Value::minLargestInt = LargestInt(~(LargestUInt(-1) / 2));
    const LargestInt Value::maxLargestInt = LargestInt(LargestUInt(-1) / 2);
    const LargestUInt Value::maxLargestUInt = LargestUInt(-1);

    const UInt Value::defaultRealPrecision = 17;

#if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
    template <typename T, typename U>
    static inline bool InRange(double d, T min, U max) {
        // The casts can lose precision, but we are looking only for
        // an approximate range. Might fail on edge cases though. ~cdunn
        // return d >= static_cast<double>(min) && d <= static_cast<double>(max);
        return d >= min && d <= max;
    }
#else  // if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
    static inline double integerToDouble(Json::UInt64 value) {
        return static_cast<double>(Int64(value / 2)) * 2.0 +
            static_cast<double>(Int64(value & 1));
    }

    template <typename T> static inline double integerToDouble(T value) {
        return static_cast<double>(value);
    }

    template <typename T, typename U>
    static inline bool InRange(double d, T min, U max) {
        return d >= integerToDouble(min) && d <= integerToDouble(max);
    }
#endif // if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)

    /** Duplicates the specified string value.
     * @param value Pointer to the string to duplicate. Must be zero-terminated if
     *              length is "unknown".
     * @param length Length of the value. if equals to unknown, then it will be
     *               computed using strlen(value).
     * @return Pointer on the duplicate instance of string.
     */
    static inline char* duplicateStringValue(const char* value, size_t length) {
        // Avoid an integer overflow in the call to malloc below by limiting length
        // to a sane value.
        if (length >= static_cast<size_t>(Value::maxInt))
            length = Value::maxInt - 1;

        char* newString = static_cast<char*>(malloc(length + 1));
        if (newString == nullptr) {
            throwRuntimeError("in Json::Value::duplicateStringValue(): "
                "Failed to allocate string value buffer");
        }
        memcpy(newString, value, length);
        newString[length] = 0;
        return newString;
    }

    /* Record the length as a prefix.
     */
    static inline char* duplicateAndPrefixStringValue(const char* value,
        unsigned int length) {
        // Avoid an integer overflow in the call to malloc below by limiting length
        // to a sane value.
        JSON_ASSERT_MESSAGE(length <= static_cast<unsigned>(Value::maxInt) -
            sizeof(unsigned) - 1U,
            "in Json::Value::duplicateAndPrefixStringValue(): "
            "length too big for prefixing");
        unsigned actualLength = length + static_cast<unsigned>(sizeof(unsigned)) + 1U;
        char* newString = static_cast<char*>(malloc(actualLength));
        if (newString == nullptr) {
            throwRuntimeError("in Json::Value::duplicateAndPrefixStringValue(): "
                "Failed to allocate string value buffer");
        }
        *reinterpret_cast<unsigned*>(newString) = length;
        memcpy(newString + sizeof(unsigned), value, length);
        newString[actualLength - 1U] =
            0; // to avoid buffer over-run accidents by users later
        return newString;
    }
    inline static void decodePrefixedString(bool isPrefixed,
        char const* prefixed,
        unsigned* length,
        char const** value) {
        if (!isPrefixed) {
            *length = static_cast<unsigned>(strlen(prefixed));
            *value = prefixed;
        }
        else {
            *length = *reinterpret_cast<unsigned const*>(prefixed);
            *value = prefixed + sizeof(unsigned);
        }
    }
    /** Free the string duplicated by
     * duplicateStringValue()/duplicateAndPrefixStringValue().
     */
#if JSONCPP_USING_SECURE_MEMORY
    static inline void releasePrefixedStringValue(char* value) {
        unsigned length = 0;
        char const* valueDecoded;
        decodePrefixedString(true, value, &length, &valueDecoded);
        size_t const size = sizeof(unsigned) + length + 1U;
        memset(value, 0, size);
        free(value);
    }
    static inline void releaseStringValue(char* value, unsigned length) {
        // length==0 => we allocated the strings memory
        size_t size = (length == 0) ? strlen(value) : length;
        memset(value, 0, size);
        free(value);
    }
#else  // !JSONCPP_USING_SECURE_MEMORY
    static inline void releasePrefixedStringValue(char* value) { free(value); }
    static inline void releaseStringValue(char* value, unsigned) { free(value); }
#endif // JSONCPP_USING_SECURE_MEMORY

} // namespace Json

// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// ValueInternals...
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
// //////////////////////////////////////////////////////////////////
#if !defined(JSON_IS_AMALGAMATION)

#include "json_valueiterator.inl"
#endif // if !defined(JSON_IS_AMALGAMATION)

namespace Json {

    Exception::Exception(String msg) : msg_(std::move(msg)) {}
    Exception::~Exception() JSONCPP_NOEXCEPT {}
    char const* Exception::what() const JSONCPP_NOEXCEPT { return msg_.c_str(); }
    RuntimeError::RuntimeError(String const& msg) : Exception(msg) {}
    LogicError::LogicError(String const& msg) : Exception(msg) {}
    JSONCPP_NORETURN void throwRuntimeError(String const& msg) {
        throw RuntimeError(msg);
    }
    JSONCPP_NORETURN void throwLogicError(String const& msg) {
        throw LogicError(msg);
    }

    // //////////////////////////////////////////////////////////////////
    // //////////////////////////////////////////////////////////////////
    // //////////////////////////////////////////////////////////////////
    // class Value::CZString
    // //////////////////////////////////////////////////////////////////
    // //////////////////////////////////////////////////////////////////
    // //////////////////////////////////////////////////////////////////

    // Notes: policy_ indicates if the string was allocated when
    // a string is stored.

    Value::CZString::CZString(ArrayIndex index) : cstr_(nullptr), m_index(index) {}

    Value::CZString::CZString(char const* str,
        unsigned length,
        DuplicationPolicy allocate)
        : cstr_(str) {
        // allocate != duplicate
        storage_.policy_ = allocate & 0x3;
        storage_.length_ = length & 0x3FFFFFFF;
    }

    Value::CZString::CZString(const CZString& other) {
        cstr_ = (other.storage_.policy_ != noDuplication && other.cstr_ != nullptr
            ? duplicateStringValue(other.cstr_, other.storage_.length_)
            : other.cstr_);
        storage_.policy_ =
            static_cast<unsigned>(
                other.cstr_
                ? (static_cast<DuplicationPolicy>(other.storage_.policy_) ==
                    noDuplication
                    ? noDuplication
                    : duplicate)
                : static_cast<DuplicationPolicy>(other.storage_.policy_)) &
            3U;
        storage_.length_ = other.storage_.length_;
    }

    Value::CZString::CZString(CZString&& other)
        : cstr_(other.cstr_), m_index(other.m_index) {
        other.cstr_ = nullptr;
    }

    Value::CZString::~CZString() {
        if (cstr_ && storage_.policy_ == duplicate) {
            releaseStringValue(const_cast<char*>(cstr_),
                storage_.length_ + 1u); // +1 for null terminating
                                        // character for sake of
                                        // completeness but not actually
                                        // necessary
        }
    }

    void Value::CZString::swap(CZString& other) {
        std::swap(cstr_, other.cstr_);
        std::swap(m_index, other.m_index);
    }

    Value::CZString& Value::CZString::operator=(const CZString& other) {
        cstr_ = other.cstr_;
        m_index = other.m_index;
        return *this;
    }

    Value::CZString& Value::CZString::operator=(CZString&& other) {
        cstr_ = other.cstr_;
        m_index = other.m_index;
        other.cstr_ = nullptr;
        return *this;
    }

    bool Value::CZString::operator<(const CZString& other) const {
        if (!cstr_)
            return m_index < other.m_index;
        // return strcmp(cstr_, other.cstr_) < 0;
        // Assume both are strings.
        unsigned this_len = this->storage_.length_;
        unsigned other_len = other.storage_.length_;
        unsigned min_len = std::min<unsigned>(this_len, other_len);
        JSON_ASSERT(this->cstr_ && other.cstr_);
        int comp = memcmp(this->cstr_, other.cstr_, min_len);
        if (comp < 0)
            return true;
        if (comp > 0)
            return false;
        return (this_len < other_len);
    }

    bool Value::CZString::operator==(const CZString& other) const {
        if (!cstr_)
            return m_index == other.m_index;
        // return strcmp(cstr_, other.cstr_) == 0;
        // Assume both are strings.
        unsigned this_len = this->storage_.length_;
        unsigned other_len = other.storage_.length_;
        if (this_len != other_len)
            return false;
        JSON_ASSERT(this->cstr_ && other.cstr_);
        int comp = memcmp(this->cstr_, other.cstr_, this_len);
        return comp == 0;
    }

    ArrayIndex Value::CZString::index() const { return m_index; }

    // const char* Value::CZString::c_str() const { return cstr_; }
    const char* Value::CZString::data() const { return cstr_; }
    unsigned Value::CZString::length() const { return storage_.length_; }
    bool Value::CZString::isStaticString() const {
        return storage_.policy_ == noDuplication;
    }

    // //////////////////////////////////////////////////////////////////
    // //////////////////////////////////////////////////////////////////
    // //////////////////////////////////////////////////////////////////
    // class Value::Value
    // //////////////////////////////////////////////////////////////////
    // //////////////////////////////////////////////////////////////////
    // //////////////////////////////////////////////////////////////////

    /*! \internal Default constructor initialization must be equivalent to:
     * memset( this, 0, sizeof(Value) )
     * This optimization is used in ValueInternalMap fast allocator.
     */
    Value::Value(ValueType type) {
        static char const emptyString[] = "";
        initBasic(type);
        switch (type) {
        case nullValue:
            break;
        case intValue:
        case uintValue:
            value_.int_ = 0;
            break;
        case realValue:
            value_.real_ = 0.0;
            break;
        case stringValue:
            // allocated_ == false, so this is safe.
            value_.string_ = const_cast<char*>(static_cast<char const*>(emptyString));
            break;
        case arrayValue:
        case objectValue:
            value_.map_ = new ObjectValues();
            break;
        case booleanValue:
            value_.bool_ = false;
            break;
        default:
            JSON_ASSERT_UNREACHABLE;
        }
    }

    Value::Value(Int value) {
        initBasic(intValue);
        value_.int_ = value;
    }

    Value::Value(UInt value) {
        initBasic(uintValue);
        value_.uint_ = value;
    }
#if defined(JSON_HAS_INT64)
    Value::Value(Int64 value) {
        initBasic(intValue);
        value_.int_ = value;
    }
    Value::Value(UInt64 value) {
        initBasic(uintValue);
        value_.uint_ = value;
    }
#endif // defined(JSON_HAS_INT64)

    Value::Value(double value) {
        initBasic(realValue);
        value_.real_ = value;
    }

    Value::Value(const char* value) {
        initBasic(stringValue, true);
        JSON_ASSERT_MESSAGE(value != nullptr,
            "Null Value Passed to Value Constructor");
        value_.string_ = duplicateAndPrefixStringValue(
            value, static_cast<unsigned>(strlen(value)));
    }

    Value::Value(const char* begin, const char* end) {
        initBasic(stringValue, true);
        value_.string_ =
            duplicateAndPrefixStringValue(begin, static_cast<unsigned>(end - begin));
    }

    Value::Value(const String& value) {
        initBasic(stringValue, true);
        value_.string_ = duplicateAndPrefixStringValue(
            value.data(), static_cast<unsigned>(value.length()));
    }

    Value::Value(const StaticString& value) {
        initBasic(stringValue);
        value_.string_ = const_cast<char*>(value.c_str());
    }

#ifdef JSON_USE_CPPTL
    Value::Value(const CppTL::ConstString& value) {
        initBasic(stringValue, true);
        value_.string_ = duplicateAndPrefixStringValue(
            value, static_cast<unsigned>(value.length()));
    }
#endif

    Value::Value(bool value) {
        initBasic(booleanValue);
        value_.bool_ = value;
    }

    Value::Value(const Value& other) {
        dupPayload(other);
        dupMeta(other);
    }

    Value::Value(Value&& other) {
        initBasic(nullValue);
        swap(other);
    }

    Value::~Value() {
        releasePayload();
        value_.uint_ = 0;
    }

    Value& Value::operator=(const Value& other) {
        Value(other).swap(*this);
        return *this;
    }

    Value& Value::operator=(Value&& other) {
        other.swap(*this);
        return *this;
    }

    void Value::swapPayload(Value& other) {
        std::swap(bits_, other.bits_);
        std::swap(value_, other.value_);
    }

    void Value::copyPayload(const Value& other) {
        releasePayload();
        dupPayload(other);
    }

    void Value::swap(Value& other) {
        swapPayload(other);
        std::swap(comments_, other.comments_);
        std::swap(start_, other.start_);
        std::swap(limit_, other.limit_);
    }

    void Value::copy(const Value& other) {
        copyPayload(other);
        dupMeta(other);
    }

    ValueType Value::type() const {
        return static_cast<ValueType>(bits_.value_type_);
    }

    int Value::compare(const Value& other) const {
        if (*this < other)
            return -1;
        if (*this > other)
            return 1;
        return 0;
    }

    bool Value::operator<(const Value& other) const {
        int typeDelta = type() - other.type();
        if (typeDelta)
            return typeDelta < 0 ? true : false;
        switch (type()) {
        case nullValue:
            return false;
        case intValue:
            return value_.int_ < other.value_.int_;
        case uintValue:
            return value_.uint_ < other.value_.uint_;
        case realValue:
            return value_.real_ < other.value_.real_;
        case booleanValue:
            return value_.bool_ < other.value_.bool_;
        case stringValue: {
            if ((value_.string_ == nullptr) || (other.value_.string_ == nullptr)) {
                if (other.value_.string_)
                    return true;
                else
                    return false;
            }
            unsigned this_len;
            unsigned other_len;
            char const* this_str;
            char const* other_str;
            decodePrefixedString(this->isAllocated(), this->value_.string_, &this_len,
                &this_str);
            decodePrefixedString(other.isAllocated(), other.value_.string_, &other_len,
                &other_str);
            unsigned min_len = std::min<unsigned>(this_len, other_len);
            JSON_ASSERT(this_str && other_str);
            int comp = memcmp(this_str, other_str, min_len);
            if (comp < 0)
                return true;
            if (comp > 0)
                return false;
            return (this_len < other_len);
        }
        case arrayValue:
        case objectValue: {
            int delta = int(value_.map_->size() - other.value_.map_->size());
            if (delta)
                return delta < 0;
            return (*value_.map_) < (*other.value_.map_);
        }
        default:
            JSON_ASSERT_UNREACHABLE;
        }
        return false; // unreachable
    }

    bool Value::operator<=(const Value& other) const { return !(other < *this); }

    bool Value::operator>=(const Value& other) const { return !(*this < other); }

    bool Value::operator>(const Value& other) const { return other < *this; }

    bool Value::operator==(const Value& other) const {
        if (type() != other.type())
            return false;
        switch (type()) {
        case nullValue:
            return true;
        case intValue:
            return value_.int_ == other.value_.int_;
        case uintValue:
            return value_.uint_ == other.value_.uint_;
        case realValue:
            return value_.real_ == other.value_.real_;
        case booleanValue:
            return value_.bool_ == other.value_.bool_;
        case stringValue: {
            if ((value_.string_ == nullptr) || (other.value_.string_ == nullptr)) {
                return (value_.string_ == other.value_.string_);
            }
            unsigned this_len;
            unsigned other_len;
            char const* this_str;
            char const* other_str;
            decodePrefixedString(this->isAllocated(), this->value_.string_, &this_len,
                &this_str);
            decodePrefixedString(other.isAllocated(), other.value_.string_, &other_len,
                &other_str);
            if (this_len != other_len)
                return false;
            JSON_ASSERT(this_str && other_str);
            int comp = memcmp(this_str, other_str, this_len);
            return comp == 0;
        }
        case arrayValue:
        case objectValue:
            return value_.map_->size() == other.value_.map_->size() &&
                (*value_.map_) == (*other.value_.map_);
        default:
            JSON_ASSERT_UNREACHABLE;
        }
        return false; // unreachable
    }

    bool Value::operator!=(const Value& other) const { return !(*this == other); }

    const char* Value::asCString() const {
        JSON_ASSERT_MESSAGE(type() == stringValue,
            "in Json::Value::asCString(): requires stringValue");
        if (value_.string_ == nullptr)
            return nullptr;
        unsigned this_len;
        char const* this_str;
        decodePrefixedString(this->isAllocated(), this->value_.string_, &this_len,
            &this_str);
        return this_str;
    }

#if JSONCPP_USING_SECURE_MEMORY
    unsigned Value::getCStringLength() const {
        JSON_ASSERT_MESSAGE(type() == stringValue,
            "in Json::Value::asCString(): requires stringValue");
        if (value_.string_ == 0)
            return 0;
        unsigned this_len;
        char const* this_str;
        decodePrefixedString(this->isAllocated(), this->value_.string_, &this_len,
            &this_str);
        return this_len;
    }
#endif

    bool Value::getString(char const** begin, char const** end) const {
        if (type() != stringValue)
            return false;
        if (value_.string_ == nullptr)
            return false;
        unsigned length;
        decodePrefixedString(this->isAllocated(), this->value_.string_, &length,
            begin);
        *end = *begin + length;
        return true;
    }

    String Value::asString() const {
        switch (type()) {
        case nullValue:
            return "";
        case stringValue: {
            if (value_.string_ == nullptr)
                return "";
            unsigned this_len;
            char const* this_str;
            decodePrefixedString(this->isAllocated(), this->value_.string_, &this_len,
                &this_str);
            return String(this_str, this_len);
        }
        case booleanValue:
            return value_.bool_ ? "true" : "false";
        case intValue:
            return valueToString(value_.int_);
        case uintValue:
            return valueToString(value_.uint_);
        case realValue:
            return valueToString(value_.real_);
        default:
            JSON_FAIL_MESSAGE("Type is not convertible to string");
        }
    }

#ifdef JSON_USE_CPPTL
    CppTL::ConstString Value::asConstString() const {
        unsigned len;
        char const* str;
        decodePrefixedString(isAllocated(), value_.string_, &len, &str);
        return CppTL::ConstString(str, len);
    }
#endif

    Value::Int Value::asInt() const {
        switch (type()) {
        case intValue:
            JSON_ASSERT_MESSAGE(isInt(), "LargestInt out of Int range");
            return Int(value_.int_);
        case uintValue:
            JSON_ASSERT_MESSAGE(isInt(), "LargestUInt out of Int range");
            return Int(value_.uint_);
        case realValue:
            JSON_ASSERT_MESSAGE(InRange(value_.real_, minInt, maxInt),
                "double out of Int range");
            return Int(value_.real_);
        case nullValue:
            return 0;
        case booleanValue:
            return value_.bool_ ? 1 : 0;
        default:
            break;
        }
        JSON_FAIL_MESSAGE("Value is not convertible to Int.");
    }

    Value::UInt Value::asUInt() const {
        switch (type()) {
        case intValue:
            JSON_ASSERT_MESSAGE(isUInt(), "LargestInt out of UInt range");
            return UInt(value_.int_);
        case uintValue:
            JSON_ASSERT_MESSAGE(isUInt(), "LargestUInt out of UInt range");
            return UInt(value_.uint_);
        case realValue:
            JSON_ASSERT_MESSAGE(InRange(value_.real_, 0, maxUInt),
                "double out of UInt range");
            return UInt(value_.real_);
        case nullValue:
            return 0;
        case booleanValue:
            return value_.bool_ ? 1 : 0;
        default:
            break;
        }
        JSON_FAIL_MESSAGE("Value is not convertible to UInt.");
    }

#if defined(JSON_HAS_INT64)

    Value::Int64 Value::asInt64() const {
        switch (type()) {
        case intValue:
            return Int64(value_.int_);
        case uintValue:
            JSON_ASSERT_MESSAGE(isInt64(), "LargestUInt out of Int64 range");
            return Int64(value_.uint_);
        case realValue:
            JSON_ASSERT_MESSAGE(InRange(value_.real_, minInt64, maxInt64),
                "double out of Int64 range");
            return Int64(value_.real_);
        case nullValue:
            return 0;
        case booleanValue:
            return value_.bool_ ? 1 : 0;
        default:
            break;
        }
        JSON_FAIL_MESSAGE("Value is not convertible to Int64.");
    }

    Value::UInt64 Value::asUInt64() const {
        switch (type()) {
        case intValue:
            JSON_ASSERT_MESSAGE(isUInt64(), "LargestInt out of UInt64 range");
            return UInt64(value_.int_);
        case uintValue:
            return UInt64(value_.uint_);
        case realValue:
            JSON_ASSERT_MESSAGE(InRange(value_.real_, 0, maxUInt64),
                "double out of UInt64 range");
            return UInt64(value_.real_);
        case nullValue:
            return 0;
        case booleanValue:
            return value_.bool_ ? 1 : 0;
        default:
            break;
        }
        JSON_FAIL_MESSAGE("Value is not convertible to UInt64.");
    }
#endif // if defined(JSON_HAS_INT64)

    LargestInt Value::asLargestInt() const {
#if defined(JSON_NO_INT64)
        return asInt();
#else
        return asInt64();
#endif
    }

    LargestUInt Value::asLargestUInt() const {
#if defined(JSON_NO_INT64)
        return asUInt();
#else
        return asUInt64();
#endif
    }

    double Value::asDouble() const {
        switch (type()) {
        case intValue:
            return static_cast<double>(value_.int_);
        case uintValue:
#if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
            return static_cast<double>(value_.uint_);
#else  // if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
            return integerToDouble(value_.uint_);
#endif // if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
        case realValue:
            return value_.real_;
        case nullValue:
            return 0.0;
        case booleanValue:
            return value_.bool_ ? 1.0 : 0.0;
        default:
            break;
        }
        JSON_FAIL_MESSAGE("Value is not convertible to double.");
    }

    float Value::asFloat() const {
        switch (type()) {
        case intValue:
            return static_cast<float>(value_.int_);
        case uintValue:
#if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
            return static_cast<float>(value_.uint_);
#else  // if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
            // This can fail (silently?) if the value is bigger than MAX_FLOAT.
            return static_cast<float>(integerToDouble(value_.uint_));
#endif // if !defined(JSON_USE_INT64_DOUBLE_CONVERSION)
        case realValue:
            return static_cast<float>(value_.real_);
        case nullValue:
            return 0.0;
        case booleanValue:
            return value_.bool_ ? 1.0f : 0.0f;
        default:
            break;
        }
        JSON_FAIL_MESSAGE("Value is not convertible to float.");
    }

    bool Value::asBool() const {
        switch (type()) {
        case booleanValue:
            return value_.bool_;
        case nullValue:
            return false;
        case intValue:
            return value_.int_ ? true : false;
        case uintValue:
            return value_.uint_ ? true : false;
        case realValue:
            // This is kind of strange. Not recommended.
            return (value_.real_ != 0.0) ? true : false;
        default:
            break;
        }
        JSON_FAIL_MESSAGE("Value is not convertible to bool.");
    }

    bool Value::isConvertibleTo(ValueType other) const {
        switch (other) {
        case nullValue:
            return (isNumeric() && asDouble() == 0.0) ||
                (type() == booleanValue && value_.bool_ == false) ||
                (type() == stringValue && asString().empty()) ||
                (type() == arrayValue && value_.map_->empty()) ||
                (type() == objectValue && value_.map_->empty()) ||
                type() == nullValue;
        case intValue:
            return isInt() ||
                (type() == realValue && InRange(value_.real_, minInt, maxInt)) ||
                type() == booleanValue || type() == nullValue;
        case uintValue:
            return isUInt() ||
                (type() == realValue && InRange(value_.real_, 0, maxUInt)) ||
                type() == booleanValue || type() == nullValue;
        case realValue:
            return isNumeric() || type() == booleanValue || type() == nullValue;
        case booleanValue:
            return isNumeric() || type() == booleanValue || type() == nullValue;
        case stringValue:
            return isNumeric() || type() == booleanValue || type() == stringValue ||
                type() == nullValue;
        case arrayValue:
            return type() == arrayValue || type() == nullValue;
        case objectValue:
            return type() == objectValue || type() == nullValue;
        }
        JSON_ASSERT_UNREACHABLE;
        return false;
    }

    /// Number of values in array or object
    ArrayIndex Value::size() const {
        switch (type()) {
        case nullValue:
        case intValue:
        case uintValue:
        case realValue:
        case booleanValue:
        case stringValue:
            return 0;
        case arrayValue: // size of the array is highest index + 1
            if (!value_.map_->empty()) {
                ObjectValues::const_iterator itLast = value_.map_->end();
                --itLast;
                return (*itLast).first.index() + 1;
            }
            return 0;
        case objectValue:
            return ArrayIndex(value_.map_->size());
        }
        JSON_ASSERT_UNREACHABLE;
        return 0; // unreachable;
    }

    bool Value::empty() const {
        if (isNull() || isArray() || isObject())
            return size() == 0u;
        else
            return false;
    }

    Value::operator bool() const { return !isNull(); }

    void Value::clear() {
        JSON_ASSERT_MESSAGE(type() == nullValue || type() == arrayValue ||
            type() == objectValue,
            "in Json::Value::clear(): requires complex value");
        start_ = 0;
        limit_ = 0;
        switch (type()) {
        case arrayValue:
        case objectValue:
            value_.map_->clear();
            break;
        default:
            break;
        }
    }

    void Value::resize(ArrayIndex newSize) {
        JSON_ASSERT_MESSAGE(type() == nullValue || type() == arrayValue,
            "in Json::Value::resize(): requires arrayValue");
        if (type() == nullValue)
            *this = Value(arrayValue);
        ArrayIndex oldSize = size();
        if (newSize == 0)
            clear();
        else if (newSize > oldSize)
            this->operator[](newSize - 1);
        else {
            for (ArrayIndex index = newSize; index < oldSize; ++index) {
                value_.map_->erase(index);
            }
            JSON_ASSERT(size() == newSize);
        }
    }

    Value& Value::operator[](ArrayIndex index) {
        JSON_ASSERT_MESSAGE(
            type() == nullValue || type() == arrayValue,
            "in Json::Value::operator[](ArrayIndex): requires arrayValue");
        if (type() == nullValue)
            *this = Value(arrayValue);
        CZString key(index);
        auto it = value_.map_->lower_bound(key);
        if (it != value_.map_->end() && (*it).first == key)
            return (*it).second;

        ObjectValues::value_type defaultValue(key, nullSingleton());
        it = value_.map_->insert(it, defaultValue);
        return (*it).second;
    }

    Value& Value::operator[](int index) {
        JSON_ASSERT_MESSAGE(
            index >= 0,
            "in Json::Value::operator[](int index): index cannot be negative");
        return (*this)[ArrayIndex(index)];
    }

    const Value& Value::operator[](ArrayIndex index) const {
        JSON_ASSERT_MESSAGE(
            type() == nullValue || type() == arrayValue,
            "in Json::Value::operator[](ArrayIndex)const: requires arrayValue");
        if (type() == nullValue)
            return nullSingleton();
        CZString key(index);
        ObjectValues::const_iterator it = value_.map_->find(key);
        if (it == value_.map_->end())
            return nullSingleton();
        return (*it).second;
    }

    const Value& Value::operator[](int index) const {
        JSON_ASSERT_MESSAGE(
            index >= 0,
            "in Json::Value::operator[](int index) const: index cannot be negative");
        return (*this)[ArrayIndex(index)];
    }

    void Value::initBasic(ValueType type, bool allocated) {
        setType(type);
        setIsAllocated(allocated);
        comments_ = Comments{};
        start_ = 0;
        limit_ = 0;
    }

    void Value::dupPayload(const Value& other) {
        setType(other.type());
        setIsAllocated(false);
        switch (type()) {
        case nullValue:
        case intValue:
        case uintValue:
        case realValue:
        case booleanValue:
            value_ = other.value_;
            break;
        case stringValue:
            if (other.value_.string_ && other.isAllocated()) {
                unsigned len;
                char const* str;
                decodePrefixedString(other.isAllocated(), other.value_.string_, &len,
                    &str);
                value_.string_ = duplicateAndPrefixStringValue(str, len);
                setIsAllocated(true);
            }
            else {
                value_.string_ = other.value_.string_;
            }
            break;
        case arrayValue:
        case objectValue:
            value_.map_ = new ObjectValues(*other.value_.map_);
            break;
        default:
            JSON_ASSERT_UNREACHABLE;
        }
    }

    void Value::releasePayload() {
        switch (type()) {
        case nullValue:
        case intValue:
        case uintValue:
        case realValue:
        case booleanValue:
            break;
        case stringValue:
            if (isAllocated())
                releasePrefixedStringValue(value_.string_);
            break;
        case arrayValue:
        case objectValue:
            delete value_.map_;
            break;
        default:
            JSON_ASSERT_UNREACHABLE;
        }
    }

    void Value::dupMeta(const Value& other) {
        comments_ = other.comments_;
        start_ = other.start_;
        limit_ = other.limit_;
    }

    // Access an object value by name, create a null member if it does not exist.
    // @pre Type of '*this' is object or null.
    // @param key is null-terminated.
    Value& Value::resolveReference(const char* key) {
        JSON_ASSERT_MESSAGE(
            type() == nullValue || type() == objectValue,
            "in Json::Value::resolveReference(): requires objectValue");
        if (type() == nullValue)
            *this = Value(objectValue);
        CZString actualKey(key, static_cast<unsigned>(strlen(key)),
            CZString::noDuplication); // NOTE!
        auto it = value_.map_->lower_bound(actualKey);
        if (it != value_.map_->end() && (*it).first == actualKey)
            return (*it).second;

        ObjectValues::value_type defaultValue(actualKey, nullSingleton());
        it = value_.map_->insert(it, defaultValue);
        Value& value = (*it).second;
        return value;
    }

    // @param key is not null-terminated.
    Value& Value::resolveReference(char const* key, char const* end) {
        JSON_ASSERT_MESSAGE(
            type() == nullValue || type() == objectValue,
            "in Json::Value::resolveReference(key, end): requires objectValue");
        if (type() == nullValue)
            *this = Value(objectValue);
        CZString actualKey(key, static_cast<unsigned>(end - key),
            CZString::duplicateOnCopy);
        auto it = value_.map_->lower_bound(actualKey);
        if (it != value_.map_->end() && (*it).first == actualKey)
            return (*it).second;

        ObjectValues::value_type defaultValue(actualKey, nullSingleton());
        it = value_.map_->insert(it, defaultValue);
        Value& value = (*it).second;
        return value;
    }

    Value Value::get(ArrayIndex index, const Value& defaultValue) const {
        const Value* value = &((*this)[index]);
        return value == &nullSingleton() ? defaultValue : *value;
    }

    bool Value::isValidIndex(ArrayIndex index) const { return index < size(); }

    Value const* Value::find(char const* begin, char const* end) const {
        JSON_ASSERT_MESSAGE(type() == nullValue || type() == objectValue,
            "in Json::Value::find(begin, end): requires "
            "objectValue or nullValue");
        if (type() == nullValue)
            return nullptr;
        CZString actualKey(begin, static_cast<unsigned>(end - begin),
            CZString::noDuplication);
        ObjectValues::const_iterator it = value_.map_->find(actualKey);
        if (it == value_.map_->end())
            return nullptr;
        return &(*it).second;
    }
    Value* Value::demand(char const* begin, char const* end) {
        JSON_ASSERT_MESSAGE(type() == nullValue || type() == objectValue,
            "in Json::Value::demand(begin, end): requires "
            "objectValue or nullValue");
        return &resolveReference(begin, end);
    }
    const Value& Value::operator[](const char* key) const {
        Value const* found = find(key, key + strlen(key));
        if (!found)
            return nullSingleton();
        return *found;
    }
    Value const& Value::operator[](const String& key) const {
        Value const* found = find(key.data(), key.data() + key.length());
        if (!found)
            return nullSingleton();
        return *found;
    }

    Value& Value::operator[](const char* key) {
        return resolveReference(key, key + strlen(key));
    }

    Value& Value::operator[](const String& key) {
        return resolveReference(key.data(), key.data() + key.length());
    }

    Value& Value::operator[](const StaticString& key) {
        return resolveReference(key.c_str());
    }

#ifdef JSON_USE_CPPTL
    Value& Value::operator[](const CppTL::ConstString& key) {
        return resolveReference(key.c_str(), key.end_c_str());
    }
    Value const& Value::operator[](CppTL::ConstString const& key) const {
        Value const* found = find(key.c_str(), key.end_c_str());
        if (!found)
            return nullSingleton();
        return *found;
    }
#endif

    Value& Value::append(const Value& value) { return (*this)[size()] = value; }

    Value& Value::append(Value&& value) {
        return (*this)[size()] = std::move(value);
    }

    Value Value::get(char const* begin,
        char const* end,
        Value const& defaultValue) const {
        Value const* found = find(begin, end);
        return !found ? defaultValue : *found;
    }
    Value Value::get(char const* key, Value const& defaultValue) const {
        return get(key, key + strlen(key), defaultValue);
    }
    Value Value::get(String const& key, Value const& defaultValue) const {
        return get(key.data(), key.data() + key.length(), defaultValue);
    }

    bool Value::removeMember(const char* begin, const char* end, Value* removed) {
        if (type() != objectValue) {
            return false;
        }
        CZString actualKey(begin, static_cast<unsigned>(end - begin),
            CZString::noDuplication);
        auto it = value_.map_->find(actualKey);
        if (it == value_.map_->end())
            return false;
        if (removed)
            *removed = std::move(it->second);
        value_.map_->erase(it);
        return true;
    }
    bool Value::removeMember(const char* key, Value* removed) {
        return removeMember(key, key + strlen(key), removed);
    }
    bool Value::removeMember(String const& key, Value* removed) {
        return removeMember(key.data(), key.data() + key.length(), removed);
    }
    void Value::removeMember(const char* key) {
        JSON_ASSERT_MESSAGE(type() == nullValue || type() == objectValue,
            "in Json::Value::removeMember(): requires objectValue");
        if (type() == nullValue)
            return;

        CZString actualKey(key, unsigned(strlen(key)), CZString::noDuplication);
        value_.map_->erase(actualKey);
    }
    void Value::removeMember(const String& key) { removeMember(key.c_str()); }

    bool Value::removeIndex(ArrayIndex index, Value* removed) {
        if (type() != arrayValue) {
            return false;
        }
        CZString key(index);
        auto it = value_.map_->find(key);
        if (it == value_.map_->end()) {
            return false;
        }
        if (removed)
            *removed = it->second;
        ArrayIndex oldSize = size();
        // shift left all items left, into the place of the "removed"
        for (ArrayIndex i = index; i < (oldSize - 1); ++i) {
            CZString keey(i);
            (*value_.map_)[keey] = (*this)[i + 1];
        }
        // erase the last one ("leftover")
        CZString keyLast(oldSize - 1);
        auto itLast = value_.map_->find(keyLast);
        value_.map_->erase(itLast);
        return true;
    }

#ifdef JSON_USE_CPPTL
    Value Value::get(const CppTL::ConstString& key,
        const Value& defaultValue) const {
        return get(key.c_str(), key.end_c_str(), defaultValue);
    }
#endif

    bool Value::isMember(char const* begin, char const* end) const {
        Value const* value = find(begin, end);
        return nullptr != value;
    }
    bool Value::isMember(char const* key) const {
        return isMember(key, key + strlen(key));
    }
    bool Value::isMember(String const& key) const {
        return isMember(key.data(), key.data() + key.length());
    }

#ifdef JSON_USE_CPPTL
    bool Value::isMember(const CppTL::ConstString& key) const {
        return isMember(key.c_str(), key.end_c_str());
    }
#endif

    Value::Members Value::getMemberNames() const {
        JSON_ASSERT_MESSAGE(
            type() == nullValue || type() == objectValue,
            "in Json::Value::getMemberNames(), value must be objectValue");
        if (type() == nullValue)
            return Value::Members();
        Members members;
        members.reserve(value_.map_->size());
        ObjectValues::const_iterator it = value_.map_->begin();
        ObjectValues::const_iterator itEnd = value_.map_->end();
        for (; it != itEnd; ++it) {
            members.push_back(String((*it).first.data(), (*it).first.length()));
        }
        return members;
    }
    //
    //# ifdef JSON_USE_CPPTL
    // EnumMemberNames
    // Value::enumMemberNames() const
    //{
    //   if ( type() == objectValue )
    //   {
    //      return CppTL::Enum::any(  CppTL::Enum::transform(
    //         CppTL::Enum::keys( *(value_.map_), CppTL::Type<const CZString &>() ),
    //         MemberNamesTransform() ) );
    //   }
    //   return EnumMemberNames();
    //}
    //
    //
    // EnumValues
    // Value::enumValues() const
    //{
    //   if ( type() == objectValue  ||  type() == arrayValue )
    //      return CppTL::Enum::anyValues( *(value_.map_),
    //                                     CppTL::Type<const Value &>() );
    //   return EnumValues();
    //}
    //
    //# endif

    static bool IsIntegral(double d) {
        double integral_part;
        return modf(d, &integral_part) == 0.0;
    }

    bool Value::isNull() const { return type() == nullValue; }

    bool Value::isBool() const { return type() == booleanValue; }

    bool Value::isInt() const {
        switch (type()) {
        case intValue:
#if defined(JSON_HAS_INT64)
            return value_.int_ >= minInt && value_.int_ <= maxInt;
#else
            return true;
#endif
        case uintValue:
            return value_.uint_ <= UInt(maxInt);
        case realValue:
            return value_.real_ >= minInt && value_.real_ <= maxInt &&
                IsIntegral(value_.real_);
        default:
            break;
        }
        return false;
    }

    bool Value::isUInt() const {
        switch (type()) {
        case intValue:
#if defined(JSON_HAS_INT64)
            return value_.int_ >= 0 && LargestUInt(value_.int_) <= LargestUInt(maxUInt);
#else
            return value_.int_ >= 0;
#endif
        case uintValue:
#if defined(JSON_HAS_INT64)
            return value_.uint_ <= maxUInt;
#else
            return true;
#endif
        case realValue:
            return value_.real_ >= 0 && value_.real_ <= maxUInt &&
                IsIntegral(value_.real_);
        default:
            break;
        }
        return false;
    }

    bool Value::isInt64() const {
#if defined(JSON_HAS_INT64)
        switch (type()) {
        case intValue:
            return true;
        case uintValue:
            return value_.uint_ <= UInt64(maxInt64);
        case realValue:
            // Note that maxInt64 (= 2^63 - 1) is not exactly representable as a
            // double, so double(maxInt64) will be rounded up to 2^63. Therefore we
            // require the value to be strictly less than the limit.
            return value_.real_ >= double(minInt64) &&
                value_.real_ < double(maxInt64) && IsIntegral(value_.real_);
        default:
            break;
        }
#endif // JSON_HAS_INT64
        return false;
    }

    bool Value::isUInt64() const {
#if defined(JSON_HAS_INT64)
        switch (type()) {
        case intValue:
            return value_.int_ >= 0;
        case uintValue:
            return true;
        case realValue:
            // Note that maxUInt64 (= 2^64 - 1) is not exactly representable as a
            // double, so double(maxUInt64) will be rounded up to 2^64. Therefore we
            // require the value to be strictly less than the limit.
            return value_.real_ >= 0 && value_.real_ < maxUInt64AsDouble&&
                IsIntegral(value_.real_);
        default:
            break;
        }
#endif // JSON_HAS_INT64
        return false;
    }

    bool Value::isIntegral() const {
        switch (type()) {
        case intValue:
        case uintValue:
            return true;
        case realValue:
#if defined(JSON_HAS_INT64)
            // Note that maxUInt64 (= 2^64 - 1) is not exactly representable as a
            // double, so double(maxUInt64) will be rounded up to 2^64. Therefore we
            // require the value to be strictly less than the limit.
            return value_.real_ >= double(minInt64) &&
                value_.real_ < maxUInt64AsDouble&& IsIntegral(value_.real_);
#else
            return value_.real_ >= minInt && value_.real_ <= maxUInt &&
                IsIntegral(value_.real_);
#endif // JSON_HAS_INT64
        default:
            break;
        }
        return false;
    }

    bool Value::isDouble() const {
        return type() == intValue || type() == uintValue || type() == realValue;
    }

    bool Value::isNumeric() const { return isDouble(); }

    bool Value::isString() const { return type() == stringValue; }

    bool Value::isArray() const { return type() == arrayValue; }

    bool Value::isObject() const { return type() == objectValue; }

    Value::Comments::Comments(const Comments& that)
        : ptr_{ cloneUnique(that.ptr_) } {}

    Value::Comments::Comments(Comments&& that)
        : ptr_{ std::move(that.ptr_) } {}

    Value::Comments& Value::Comments::operator=(const Comments& that) {
        ptr_ = cloneUnique(that.ptr_);
        return *this;
    }

    Value::Comments& Value::Comments::operator=(Comments&& that) {
        ptr_ = std::move(that.ptr_);
        return *this;
    }

    bool Value::Comments::has(CommentPlacement slot) const {
        return ptr_ && !(*ptr_)[slot].empty();
    }

    String Value::Comments::get(CommentPlacement slot) const {
        if (!ptr_)
            return {};
        return (*ptr_)[slot];
    }

    void Value::Comments::set(CommentPlacement slot, String comment) {
        if (!ptr_) {
            ptr_ = std::unique_ptr<Array>(new Array());
        }
        (*ptr_)[slot] = std::move(comment);
    }

    void Value::setComment(String comment, CommentPlacement placement) {
        if (!comment.empty() && (comment.back() == '\n')) {
            // Always discard trailing newline, to aid indentation.
            comment.pop_back();
        }
        JSON_ASSERT(!comment.empty());
        JSON_ASSERT_MESSAGE(
            comment[0] == '\0' || comment[0] == '/',
            "in Json::Value::setComment(): Comments must start with /");
        comments_.set(placement, std::move(comment));
    }

    bool Value::hasComment(CommentPlacement placement) const {
        return comments_.has(placement);
    }

    String Value::getComment(CommentPlacement placement) const {
        return comments_.get(placement);
    }

    void Value::setOffsetStart(ptrdiff_t start) { start_ = start; }

    void Value::setOffsetLimit(ptrdiff_t limit) { limit_ = limit; }

    ptrdiff_t Value::getOffsetStart() const { return start_; }

    ptrdiff_t Value::getOffsetLimit() const { return limit_; }

    String Value::toStyledString() const {
        StreamWriterBuilder builder;

        String out = this->hasComment(commentBefore) ? "\n" : "";
        out += Json::writeString(builder, *this);
        out += '\n';

        return out;
    }

    Value::const_iterator Value::begin() const {
        switch (type()) {
        case arrayValue:
        case objectValue:
            if (value_.map_)
                return const_iterator(value_.map_->begin());
            break;
        default:
            break;
        }
        return {};
    }

    Value::const_iterator Value::end() const {
        switch (type()) {
        case arrayValue:
        case objectValue:
            if (value_.map_)
                return const_iterator(value_.map_->end());
            break;
        default:
            break;
        }
        return {};
    }

    Value::iterator Value::begin() {
        switch (type()) {
        case arrayValue:
        case objectValue:
            if (value_.map_)
                return iterator(value_.map_->begin());
            break;
        default:
            break;
        }
        return iterator();
    }

    Value::iterator Value::end() {
        switch (type()) {
        case arrayValue:
        case objectValue:
            if (value_.map_)
                return iterator(value_.map_->end());
            break;
        default:
            break;
        }
        return iterator();
    }

    // class PathArgument
    // //////////////////////////////////////////////////////////////////

    PathArgument::PathArgument() : key_() {}

    PathArgument::PathArgument(ArrayIndex index)
        : key_(), m_index(index), kind_(kindIndex) {}

    PathArgument::PathArgument(const char* key)
        : key_(key), m_index(), kind_(kindKey) {}

    PathArgument::PathArgument(const String& key)
        : key_(key.c_str()), m_index(), kind_(kindKey) {}

    // class Path
    // //////////////////////////////////////////////////////////////////

    Path::Path(const String& path,
        const PathArgument& a1,
        const PathArgument& a2,
        const PathArgument& a3,
        const PathArgument& a4,
        const PathArgument& a5) {
        InArgs in;
        in.reserve(5);
        in.push_back(&a1);
        in.push_back(&a2);
        in.push_back(&a3);
        in.push_back(&a4);
        in.push_back(&a5);
        makePath(path, in);
    }

    void Path::makePath(const String& path, const InArgs& in) {
        const char* current = path.c_str();
        const char* end = current + path.length();
        auto itInArg = in.begin();
        while (current != end) {
            if (*current == '[') {
                ++current;
                if (*current == '%')
                    addPathInArg(path, in, itInArg, PathArgument::kindIndex);
                else {
                    ArrayIndex index = 0;
                    for (; current != end && *current >= '0' && *current <= '9'; ++current)
                        index = index * 10 + ArrayIndex(*current - '0');
                    args_.push_back(index);
                }
                if (current == end || *++current != ']')
                    invalidPath(path, int(current - path.c_str()));
            }
            else if (*current == '%') {
                addPathInArg(path, in, itInArg, PathArgument::kindKey);
                ++current;
            }
            else if (*current == '.' || *current == ']') {
                ++current;
            }
            else {
                const char* beginName = current;
                while (current != end && !strchr("[.", *current))
                    ++current;
                args_.push_back(String(beginName, current));
            }
        }
    }

    void Path::addPathInArg(const String& /*path*/,
        const InArgs& in,
        InArgs::const_iterator& itInArg,
        PathArgument::Kind kind) {
        if (itInArg == in.end()) {
            // Error: missing argument %d
        }
        else if ((*itInArg)->kind_ != kind) {
            // Error: bad argument type
        }
        else {
            args_.push_back(**itInArg++);
        }
    }

    void Path::invalidPath(const String& /*path*/, int /*location*/) {
        // Error: invalid path.
    }

    const Value& Path::resolve(const Value& root) const {
        const Value* node = &root;
        for (const auto& arg : args_) {
            if (arg.kind_ == PathArgument::kindIndex) {
                if (!node->isArray() || !node->isValidIndex(arg.m_index)) {
                    // Error: unable to resolve path (array value expected at position...
                    return Value::null;
                }
                node = &((*node)[arg.m_index]);
            }
            else if (arg.kind_ == PathArgument::kindKey) {
                if (!node->isObject()) {
                    // Error: unable to resolve path (object value expected at position...)
                    return Value::null;
                }
                node = &((*node)[arg.key_]);
                if (node == &Value::nullSingleton()) {
                    // Error: unable to resolve path (object has no member named '' at
                    // position...)
                    return Value::null;
                }
            }
        }
        return *node;
    }

    Value Path::resolve(const Value& root, const Value& defaultValue) const {
        const Value* node = &root;
        for (const auto& arg : args_) {
            if (arg.kind_ == PathArgument::kindIndex) {
                if (!node->isArray() || !node->isValidIndex(arg.m_index))
                    return defaultValue;
                node = &((*node)[arg.m_index]);
            }
            else if (arg.kind_ == PathArgument::kindKey) {
                if (!node->isObject())
                    return defaultValue;
                node = &((*node)[arg.key_]);
                if (node == &Value::nullSingleton())
                    return defaultValue;
            }
        }
        return *node;
    }

    Value& Path::make(Value& root) const {
        Value* node = &root;
        for (const auto& arg : args_) {
            if (arg.kind_ == PathArgument::kindIndex) {
                if (!node->isArray()) {
                    // Error: node is not an array at position ...
                }
                node = &((*node)[arg.m_index]);
            }
            else if (arg.kind_ == PathArgument::kindKey) {
                if (!node->isObject()) {
                    // Error: node is not an object at position...
                }
                node = &((*node)[arg.key_]);
            }
        }
        return *node;
    }

} // namespace Json
